Which of the following will always determine exactly one triangle

For the equation below, x is the input and y is the output. y = -4x + 3 if the input is -8, then the output is

The tuition costs, c, for a local community college are modeled by c(h) = 250 + 200h, where h represents the number of credit hours taken. the local state university has tuition costs, s, modeled by the function s(h) = 300 + 180h. how many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.

One positive number is 9 more than twice another. if their product is 95, find the numbers